We can't predict for long term but for 2 to 3 years bit coin will be used as the medium of exchange of goods and services. In coming future btc will have the highest value of all currency. If I see it as 10 years from now than it can be the currency of some country as dollar.
I am looking forward that Bitcoin or crypto currency will be more stable on the market treed in the future, although, no can predict the out come in the trading market, but i am optimistic that Bitcoin will over come the challenges is now facing on the issue of Regulation by its government financial institution. The growing acceptance on the global market, the volume of investment coming in, this are just few indicator that Bitcoin will be one of the leading currency in digital transaction in the future.